Proportional gas and air mixer.



M. A. POSSONS. PROPQRTIONAL GAS AND AIR MIXER.

APPLICATION FILED JAN. 3, 1916.

1 ,1 g 1 ,823. Patented July 18, 1916.

2 SHEETS-SHEET 1.

M. A. POSSONS. PROPORTIONAL GAS AND AIR MIXER. APPUCYATION men IAN. a. l9l6.

1 ,191,823. Patented July 18, 1916 2 SHEETS-SHEET 2.

(/Lf un 61' T,

STATES P rENT DFFICE.

MINARD arossons, F CLEVELAND; omo, ASSIGNOB. T0 AMERICAN STOVE COMPANY,

OEST. LOUIS, MISSOURI, A CORPORATION OF NEW JERSEY.

PRoPoR'rIoNAL GAS AND AIR Maxi-1R.

Y '0 'all wh om it concern:

Be it known that 'I, Miriam) A. Possess,

a citizen of the United States, residing at Cleveland, in the county of Uuy'ahoga and therein to the accompanying driiwiiw.

'lhis inventionrelates to improvements in proportional gas and air mixers, the prinniry object of which is to have the shutter operatively connected with the gas valve whereby the amount of air fed to the gas supply is automatically regulated in proportion to the supply of gas through the gas valve. I i

A further object of my present invention is to operatively connect the shutter with an dtljllfittlblt. gas orifice which controls the amount of gas fed to the burner the'reby automatically proportioning the proper amount of air and gas which'are supplied to the burner; r 3

A further object of my present invention is to operatively'connect a gas valve with. an

adjustable gas orifice and to operatively con-. .nect a shutter with'the said yalveand'ad1 justa bl'e orifice, whereby the proportion of gas and air are automatically regulated as the supplyof gas is increased or diminished.'

A further object of'my present invention IS tU operatively connect an automatic air control and a gas valvejfor automatically pi-opo -tioning the'an'iount of gas and air,"

and to combine with these an adjustable alir controlling shutter to adapt the device for difi' kinds of gas and' for different gra 'igas. Y

12 further obliect of my invention relates to tlie specific arrangement and construction of -pa rts whereby the proper proportion'. f{ air and gas supplied to the burner is automatically controlled.

In theaccompanying drawings, Figure l is a froiit'elevation of a gasfbiirner shutter and gas valve which-embody my invention.

Fig. 2 is a sectional view showing the shutter and gas Supplywide open. Fig. 3 is an inverted plan view showing the operative parts in position with the gas supply Closed.

Fig. 4-is an interior plan view partly in section showing the adpistable. shutter Specification of Letters Patenti Qignited;

'a shutter which does not, in'ate from that in common use Patented July 18, 1916.

v Application filed January 8, 1916. Serial No. 70,001.

moved to limit. the amount of air in the proportion to the amount of gas supplied. Fig.

5 is an interior view of the shutter with the gas orifice and gas valve removed and the shutter shown wide open. Fig. (i is a perspective'view of the partsconiprisiiw the improvement in separated relation. lig. 7 is a sectional view showing-thegas supply closed. Fig. 8 -is an interior.elevation showing the gas supply closed.

Itis well understood by those skilled in thls arl that gas burners operate on the fiuiisen principle, in that there is a mixture of air and gas that are supplied to the burner head freon-which it News andis It is also understoml by those skilled in tliisnrt that in order to get proper combustion, itis essentialt oobtain a proper proportionofair and gas; Fontliis purpose .Hi gas stoves there is supplied what isk'nowii as a fshutter,,"" for adjii'stably (tollitl' ol liiig'i the aniount'of that Isiipplied to the gas conduit to beam ed :Wltll the gastliat is fed tothe lnirne 'l; i

In carrying out my"invention I proviile astatmnary shutter casing 1 which has a ihub portion 2 connected ,with the valve .cas-

ing in which the ordinary gas-valve or cock 4 is located and turns in the usual manner. The outer shutter casing 1 as here shown, is attached to the valvecasing 3 by screw-threads, though other-means of connection may be provided without affecting my present improvement. For the 'purpose of operating the gas valve 4, it is provided with the usual laterally extending handle 5,

and the valve and casing areprovided with the usual gas ports 6 and 7, and :thcse gas orts are caused to register and not to register by the tiirniiig of the gas valve in the usual way. The shutter casing-1 is provided witha plurality of 'air inlet openings 8 through which air will pass into the'mixing tube 9 (Fig. 7 and into which-tube the gas also passes throughi'a gas orifice Thus fax-,1 have described 'afig s i'alye and flow of gas through the said orifice.

valve casing 3 has projecting inwardly therefrom a hollow projection 13 with its end terminating with a needle valve ll. This member 13 projects within the longitudinally movable nozzle 11, and its needle valve 14 is adapted to enter and cooperate with the gas orificeIO for controlling the A plurality of gas outlet passages 15 are formed in the end of the'hollow projection 13 so that gas may flow from the port Ithrough thesepassages into the nozzle 11 and through the orifice 10 when the orifice is not closed by the needle valve 14 and the gas valve 4 is in its open position. It desired, a packing 16 may be rovided between the nozzle 11 and the ad acent inner wall of the valve casing 3 to prevent any leakage of gas between these parts.

A movable shutter 17 cooperates with the stationary shutter casing 1 to control the flow of air through the shutter, and this movable shutterfinember 1? is operatively connected with the gas valve 4 in the' fol lowing manner: A sleeve 18 loosely surrounds the projecting end 12 of the valve casing 3, and this sleeve has its outer edge provided with a projection 19 that fits in an opening 20 of the movable shutter 17. In the construction here. shown, the movable shutter 17 is placed within the stationary shutter casing 1 and is provided with a plurality of air passages 21 corresponding in num er, shape and approximately in size with the air openings 8 of the casingl. This projection 19 extends through an elongated opening 22 formed in the stationary casing 1 thus permitting the oscillation of the sleeve 18 and as it is oscillated, the movable shutter 17 will be correspondingly oscillated.

The gas valve 4 is ojieratively connected with the sleeve 18 by providing a segemental gear 23 that is carried by one end of the gas valve, and as here shown, it is carried by the end opposite the handle 5, and the segmental gear is provided with an angular opening 24 fitting an angular projection of the end of the gas valve 4, and the segmental gear is held in position by the usual spiral spring 26, washers 27 and screw nut 2b. Meshing with the segmental gear 23 are gear teeth 29 formed on the adjacent edge of the sleeve 18. From the foregoing, it will be understood that when the gas valve is turned. the sleeve and the movable shutter 17 are correspondingly turned. In this way when the gas valve is open thc'shutter 17 moves and will close the air openings ti of the stationary casing 1 according to the am unt of gas passingthrough' the gas port.

' The gas valve t has a quarter turn from open to closed positions. and by reason of this amount of movement. with thegear ratio here shown the movable shutter 21 is moved a distance twice that of the size of the conditions of the local markets.

in position within the casing 1. it will be understood that the shutter 30 may the air openings 8 since the air openings are of a width approximately one-eighth of the circumference of the shutter casing 1. Owing to this fact with the gas valve in closed position (as shown in Fig. 7) the air passages 8 and'21 register so that they are full open. However, owing to the size of the gas ports 0 and 7 it requires approximately one half of the movement of the gas valve before the ports 6 and 7 begin to register, and this movement half is equivalent to oneeighth ofa complete circle of movement so that when the gas valve has moved half of its paththe passages 8 and 21 are out of regclosed. A further opening movement of the valve will admit gas and immediately the air passa'ges of the shutter begin to open and the opening increases as the valve is open, and when full open, the air passages are corres ondingly full open.

hus far, I have described one feature of my invention, viz., operatively connecting a movable shutter with the gas valve so that as the gas is supplied, the amount of air is automatically supplied in proportion to the flow of gas.

' It is known to those skilled in the art that different grades of gas, and different kinds of gas require different amounts of air for proper combustion. This is particularly true in respect to natural and artificial gas, and to a certain extent is true in respect to different grades of the same kind of gas. In

order to adopt my automatic shutter to universal use for different kinds and grades of gas, I provide means for limiting the size of the air passages of the shutter according to This I accomplish by means of an adjustable shut- T530 which is of a cup-shaped form and will fit within the cup-shaped stationary casing 1. This adjustable cup-shaped shutter 30 is provided with air. passages 31 which correspond in number, size, and shape to the passages 8 and 21 of the shutter members 1 and 17. the center portion of the shutter 30 being cut out as shown at 32 for the accommodation of certain other constructions to be described presently, and because it is not necessary that the wing 33 of the shutter 30 extend over the hub portion 34 of the easing 1. v

The adjustable shutter member 30 is made of a size to snugly fit within the shutter casing 1 and its annular wall is provided with knocked out lugs 35adapted to spring out ward into the slots 36 of the annuiar wall or the outer wall of. the openings 36 thus removably holding the adjustable shutter 30 From this,

beturned within the casing 1 to carry its wings extending over the air openings of the .the casing 1 and to. engage the underside of '12 y [of automatically controlling the ttow of airaccording to the flowof gas, and to further provide means for adjusting the size of the air openings of the movable and stationary v parts of the burner for the-purpose'of accommodatingit to local gas conditions.

-' Thus I have described my invention of the automatic and adjustable shutter for use with the ordinary valve 4. However,

- owing to the gas ports 6 and 7 of the ordi with the aforesaidfeatures in 'ually' opens and nary gas valve and the gas valve casing,"the adjustment. ofLtlIe gas supply is not weir adapted for a fine adjustment.

For the purpose of providing means which adapt the gradual increase of gas supply as the gas valve and shutterare' open thereby providing a grajdual supply of gas and a corresponding gradual supply of air proportioned toeach other, I provide and combine with the automatic and adjustable shutters,

an au The;a'utomaticallly adjustable supply brifice of my present inventio'gn is co bined the fol owing manner: I have previouslv eferred herein to th'e'nozzle 11 and'the needle valve 14 for coiitrollingthe orifice 10 of the nozzle 11, and ;I-' w ill now explain how the'supp ly of gas is gradually'controlledthrough the orifice 10in proportion to the gradual opening of the air passagesof-the shutter members. I accomplish this by'providing the'nozzle 11 with a lateral pin or pins 37 which project into cam shaped passages 38 of a hub 39 which projects from the, movable shutter 17, ,56 thatas thes'hutter 17 is turned bacK 'iihd forth, the walls of the cam passages move the nozzle 1.1 in and out in respect to the needle 14, and in that way gradcloses the orifice 10 and gradually increases and diminishes the sup- P y o moved or opening or closing-the air passages of the shutter members. Any suitable means may be provided for preventing the rotation of the nozzle lljiput as here shown, it consists improviding the inner end of the nozzle. 11 with a slot 40 which receives a pin 41 projecting inward from the portion} 12 of the valve casing. As hereiri statcd the val throughout one eightn of a' circle before the ports ,3 and 7 begin to register for the flow at gas, and becauseof this the orificell) must not begin to open until the ports-(3 and 'l begin to m imr. This is accomplished tomatically adjustable gas supply ori as as.-the shutteigl'l is gradually.

. fi ve '4 is moved by providing the cam slot 38 with the straight portion 42 of a length to permit the amount of gas supply with the amount of air supply. ting a small'supply of air. through theshut For the purpose of permit-- ter at all time's,l provide one wall ,of the openings formed in the member 1 with notches lfrl. By this peans there is always permitted a small-supply of air to the mixingchamber so that there will be .air' for any gas that may find its way into-the mi.\-'

ving chamber as the valve and orifice are,

- being open should theyopcn slightly before the movable shutter member 17 has opened the air passages 8 of the casing- 1, and to supply a suflicient quantity of air when the burner is turned down low and the shutter approximately closed. For the purpose of facilitating the assembling and-separating of the parts, not'ches'M incommunication. with the cam slots 38 are provided to permit the entrance and removal of the-pins 37 into the cam slots, v

Having thus'fully d cribedmy invention what I claim and desire o secure by Letters "Patentisz. a

- 1. In a gas control; for gas.stoves, the com bination of a valve casing having'a gas port terminating in an outlet orifice, a main valve controlling the gas port inadvance of the orifice, an adjustable member controllingthe o rifice, and an operative.connection-between the ,valveand' the adjustable member, the operative connection including a slot having an initial straight wallextending in the direction of movement of the connection and afinal cam-wallto permit-theopening of the main valve in advance-of the operation of-the adjustable member.

a 2. In a gas control bination of-a valve casing having a gas port terminating in an outlet orifice, a main valve jicontrolling-the gas port in advance of the ,orifice, an endwise adjustable member controllingthe orifice, an oscillating member operatlvely connected with the main valve, I having a slot and pin connection with the endwise adjustable member, theslot having a straight wall and-a cam-wal and an operative connection between the main valve and oscillating member for the purpose de-' scribed. I 1

3 A shutter for gas stoves comprising a for gas stoves, the coin-- nScHlating gear moiyihcr.'conhgcte l with they the puifi'm se described; 20 5' s ports; an inl- (int'r'ol ling the air supply;

- lmcmhr zind thegshutt er, the connection hklV- the [mi-pose dcscpihcd.

ing a straight Way 51nd zin ipiind way for. 30

.umnprisirlg u valve casing liaving a ggs port terminating ina gusoqifice a ln ai n'gas valve controll'lnggth v.v L45 pm-L, an ad ustable mem- 36 ber fur the m-ilic c, stationary and oscillating; shuttcy HllllliCliS for gioutrolling the air sup ply, the u'svilhptingfihl'ittf member having a hub sug-liuuhding thdbrifih adjustable;

'twwn'tlw "min gusm'lve; and tlfc oscillating" 55 "In tcstuum y whereof I hereunto affix my Ami-mi) 1A.. mssom 

